S&P 500: The Winners and Losers of July 2026
S&P 500: The Winners and Losers of July 2026
The S&P 500 finished July 2026 essentially flat, closing down 0.13% for the month. That headline number conceals one of the most dramatic reversals of the year beneath the surface. Out of the 500 index constituents, 302 ended July in positive territory, while 197 closed in the red, meaning the majority of stocks actually advanced even as the index slipped. The declines were concentrated in the market’s largest and most crowded AI infrastructure winners, while the gains were spread across previously beaten-down IT services and software names. July was, in effect, a month-long rotation: money moved out of semiconductors, memory, and optical networking and into the consulting and engineering firms that had spent the first half of the year being priced as AI’s victims. In this article, we break down the top winners and losers in the S&P 500 for July 2026 and examine the key drivers behind their stock movements.
Top S&P 500 Performers in July
Among the top performers were Cognizant Technology Solutions ($CTSH), Accenture (ACN), and EPAM Systems (EPAM). All three are IT services companies that had been sold off heavily in June on fears that generative AI would automate away their core business. Here’s a closer look at why each of these stocks stood out:
Cognizant Technology Solutions ($CTSH) +43%
Cognizant Technology Solutions, an IT services and consulting company that builds, modernizes, and manages technology systems for large enterprises, rose roughly 43% in July to become the S&P 500’s leading monthly gainer. The stock entered the month depressed after being dragged down alongside Accenture in June, when the sector sold off on concerns that AI would compress demand for traditional consulting work.
Cognizant spent the first three weeks of July undermining that thesis. Its July announcements included an OpenAI cyber-defense initiative, an expanded Google Cloud relationship, expanded work with Anthropic, an agentic-AI agreement with Novartis, and a new EMEA AI unit. The company also said it was on track to hire 1,500 U.S. college graduates during 2026, a commitment that sat awkwardly against the assumption that AI would shrink services headcount.
The decisive catalyst arrived on July 29. Cognizant reported second-quarter revenue of $5.481 billion, up 4.5% year over year, and adjusted earnings per share of $1.37. Operating margin expanded 40 basis points to 16.0%, and Financial Services, its largest segment, grew 12%. Management raised full-year adjusted EPS guidance to $5.70 to $5.82, as detailed in the accompanying Form 8-K. The stock rose roughly 10% on the forecast increase. Quarterly bookings fell 6% and the revenue range narrowed, making the report genuinely mixed, but investors treated the margin and earnings result as proof that Cognizant’s AI strategy could grow profits rather than erode its business.
Accenture ($ACN) +33%
Accenture, one of the world’s largest professional services and consulting firms, gained approximately 33% in July, a recovery driven by mean reversion and sector rotation rather than any new financial disclosure, since the company did not report earnings during the month.
The setup came from June. On June 18, Accenture fell roughly 18% in its worst single-day decline on record after reporting bookings down 3% and trimming the high end of its full-year revenue growth outlook to 3% to 4%. Profitability was not the problem, with earnings per share up 9% and free cash flow of $3.6 billion, but the market fixated on the outlook and the risk that AI could compress the consulting model. On June 23, management increased planned fiscal-year repurchases by $2 billion to $7.5 billion and said directly that the share price did not reflect the company’s financial strength, creating a source of demand that carried through July.
Accenture also kept announcing AI deployments, including prebuilt agentic-AI solutions with Google Cloud, an AI Assistant for the European Commission with over 2,000 regular users, and a European banking platform collaborationwith UniCredit and IBM on the final trading day.
The clearest driver was cross-sectional. Accenture rose 6.9% on July 28 alone as semiconductor shares sold off. The simultaneous moves in Cognizant, EPAM, and Indian IT services stocks point to factor rotation and short covering rather than an Accenture-specific development.
EPAM Systems ($EPAM) +31%
EPAM Systems, a software engineering and digital product development company that builds custom applications for enterprise clients, gained roughly 31% in July, with almost the entire move concentrated in the final week.
EPAM had no July earnings report, since its second-quarter results were scheduled for August 6, leaving investors to trade on valuation and sector positioning. The stock was still around $86 on July 23 after the earlier IT services selloff. The turn began July 24 and survived a bearish analyst action, with Citigroup cutting its price target to $100 from $112 on July 27 while the shares rose that day anyway.
The company-specific catalyst landed on July 28, when EPAM announced it had joined the OpenAI Partner Network at the Advanced level, saying it planned to certify more than 5,000 consultants during the first year. The announcement addressed the central bear case against EPAM, that AI would replace its engineers, by repositioning the company as the party responsible for connecting frontier models to real enterprise systems. The stock rose roughly 6% in each of the two sessions around the announcement.
Worst S&P 500 Performers in July
Among the biggest decliners in the S&P 500 for July 2026 were Sandisk (SNDK), Corning (GLW), and KLA Corporation (KLAC). What links them is not deteriorating fundamentals, since none issued a profit warning and two beat expectations, but rather the unwinding of extremely crowded positions in AI infrastructure. The iShares Semiconductor ETF fell 22.1% during the month. Here’s a closer look at what drove their underperformance.
Sandisk ($SNDK) -47%
Sandisk, a flash storage company serving data center, enterprise, and consumer markets, fell approximately 47% in July to become the S&P 500’s worst performer for the month, despite issuing no adverse company news during the period.
Its own July communications were positive or neutral. On July 2, Sandisk announced it had begun sampling BiCS10 1-terabit TLC 3D NAND, a 332-layer technology offering a claimed 59% bit-density improvement. On July 9, it scheduled fiscal fourth-quarter results for August 5, issuing no new guidance.
What changed was the backdrop. Sandisk had appreciated several hundred percent during 2026 on favorable NAND pricing and AI storage demand, leaving it exposed to any shift in positioning. Hedge funds cut semiconductor exposure for a fourth consecutive week in early July. The sharpest blow came July 27, when Chinese memory producer CXMT rose 466% in its Shanghai debut and reports emerged of domestically produced immersion DUV lithography equipment. Sandisk fell about 11% that day.
The most revealing detail came at month-end. On July 30, Sandisk rebounded nearly 24% in a single session, leading the S&P 500, as memory shares surged on stronger AI signals. A company facing genuine structural deterioration would not recover that violently on sector sentiment alone.
Corning ($GLW) -46%
Corning, a materials science company that manufactures optical fiber, specialty glass, and display technologies, fell approximately 46% in July after delivering strong results that were not strong enough to justify the expectations embedded in its share price. The shares had risen roughly 64% during the year before the report, leaving little room for anything short of a clear beat.
On July 28, Corning reported second-quarter core sales of $4.74 billion, up 17%, and core earnings per share of $0.78, up 30%. Optical Communications sales rose 32%, with Enterprise Networks growing 65%. But the company guided third-quarter core sales to $4.9 billion to $5.0 billion, only around or slightly below consensus, with results filed in a Form 8-K the same day.
The stock fell more than 20% in early trading. Analysts focused on slower sequential fiber growth, capacity constraints, and a planned $2 billion capacity investment that meant cash outlays ahead of the associated earnings benefits. The decline spread to other optical names including Ciena, Coherent, and Lumentum. Corning did not issue bad guidance in absolute terms. It issued guidance that failed to validate the expectations its share price had already priced in.
KLA Corporation ($KLAC) -39%
KLA Corporation, a semiconductor equipment company specializing in inspection, metrology, and process control systems used in chip manufacturing, fell approximately 39% in July, reportedly its worst monthly performance on record, despite results that exceeded published estimates.
The decline began before its earnings. Chip shares weakened in early July as hedge funds cut exposure following a strong first half, and fell again on July 16 and 17 even as TSMC posted strong results. On July 27, the CXMT debut and Chinese lithography reports hit KLA alongside ASML, Lam Research, and Applied Materials.
KLA reported fiscal fourth-quarter revenue of $3.658 billion on July 28, up roughly 15% year over year, with non-GAAP earnings per share of $1.05 at the high end of guidance, and guided the September quarter modestly ahead of consensus in its Form 8-K. The stock fell anyway. Analysts contrasted the results with stronger signals from Lam Research and Applied Materials and expressed caution about systems growth. The market was comparing KLA not against consensus but against best-in-class peer outcomes and the valuation its prior run had established. It recovered part of the loss on July 30 during a broad chip rebound, without releasing any new information that day.
What the Month Really Said
July’s dispersion answered a single question in an unexpected way: does AI shift economic value away from human-centered services and toward hardware, or does the implementation burden create durable demand for both? Through the first half of 2026, the market had answered decisively in favor of hardware, bidding up memory, optical networking, and semiconductor equipment while discounting IT services companies on the assumption that AI would automate consulting and software engineering away. July partially reversed that trade.
The important nuance is that none of the three biggest losers reported a deteriorating business. Sandisk issued no adverse financial news at all, Corning grew core sales 17% and optical revenue 32%, and KLA beat its estimates and guided above consensus. They declined because their prices demanded continuing acceleration, and profit-taking, questions about hyperscaler returns on AI capital spending, China’s semiconductor ambitions, and peer-relative comparisons made investors unwilling to keep paying extreme multiples. Meanwhile, only Cognizant supplied genuine fundamental proof on the winning side. Accenture and EPAM rose mainly on valuation recovery, short covering, and accumulating evidence that enterprises still need integration, governance, and modernization expertise.
The fact that 302 stocks advanced in a month the index finished slightly lower tells the rest of the story. The losses were concentrated at the top, in the largest and most crowded positions. July was less a verdict that services had won and hardware had lost than a rapid reallocation away from high-expectation AI beneficiaries toward companies whose valuations already reflected substantial disruption risk.
This article is for informational purposes only and is not investment advice or a solicitation to buy or sell securities. The content is based on publicly available information and reflects the author’s opinions as of the publication date, which may change without notice. All investments carry inherent risks, including the potential loss of principal, and past performance is not indicative of future results. Readers should conduct their own research or consult a financial advisor before making investment decisions. BBAE holds no position in the securities mentioned, nor are they compensated by the companies mentioned.
